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  • Articles: DFG German National Licenses  (8)
  • 1985-1989  (8)
  • 1
    Electronic Resource
    Electronic Resource
    Effect of Ga addition to NdFeCoB on their magnetic properties (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 1043-1045 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It was found that the Ga addition to NdFeCoB magnets was very effective for improving their magnetic properties. Magnets with high boron concentration had a high coercive force and magnets with low boron concentration had a high-energy product. The following magnetic properties were obtained: (1) Nd14.5FebalCo16Ga1B9.5:Br=12.0 kG, IHc=15.3 kOe, (BH)max=34 MGOe, Tc=500 °C (2) Nd14.5FebalCo16Ga1B5.5:Br=13.1 kG, IHc=12.2 kOe, (BH)max=40 MGOe, Tc=500 °C. It was also found that NdFeCoGaB magnets with very low boron concentration still had a relatively high coercive force.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98773
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of large boron additions to magnetically hard Fe-Pt alloys (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 2537-2540 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic properties were investigated for the ternary (Fe0.6Pt0.4)100−xBx and (Fe1−yPty)83B17 alloy ribbons prepared by the twin roll technique. Boron changes the compositions of the ordered FePt (γ1) phase, which coexists with Fe2B at various alloy compositions so that the actual Pt content of γ1 in the ternary alloy goes up with increasing boron content. Coercive force increase due to boron addition is remarkable, in particular at low Pt concentration. Annealing time to get high coercivity becomes much shorter by boron addition. iHc=5.6 kOe and 4πMs=7.8 kG were obtained in the (Fe0.65Pt0.35)83B17 ribbon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341638
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Very low loss ultrathin Co-based amorphous ribbon cores (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 6050-6052 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ultrathin Co-based amorphous ribbons with a thickness of 6–10 μm were fabricated by a single roller quenching method in vacuum. The compositions of the alloys were zero magnetostrictive: Fe4.7Co70.3Si15B10 and (Fe0.05Co0.95)71(Si0.5B0.5)29. The ribbons obtained had good smoothness and dimensional uniformity. The core loss of toroidal samples 15 mm in diameter was measured after annealing. The loss decreased with decreasing ribbon thickness. In the case of 6.4-μm-thick (Fe,Co)71(Si,B)29 amorphous ribbon, the values at 100 kHz and 1 MHz were 40 mW/cm3 and 1.8 W/cm3 for Bm=0.1 T, respectively. The former was 1/4 that of Mn-Zn ferrites or 1/2 that of 5-μm-thick Supermalloy tape wound core loss. The latter was (2)/(3) that of 5-μm Supermalloy tape wound core loss. In addition, the initial permeability beyond 100 kHz was also markedly improved by thickness reduction. The values of 6.4-μm-thick (Fe,Co)71(Si,B)29 ribbon measured at 1 and 10 MHz were about 7000 and 1000 for Hm=2 mOe, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342151
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    New application of complex magnetic materials to the magnetic refrigerant in an Ericsson magnetic refrigerator (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 3873-3878 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A complex new magnetic refrigerant, suitable for the ideal Ericsson cycle, has been investigated. Above ∼15 K it is necessary to use ferromagnets as a magnetic refrigerant. However, temperature variation for the magnetic entropy change in a homogeneous ferromagnet is not suitable for the Ericsson cycle. The present paper verifies, from theoretical analysis, that a complex ferromagnetic material, for instance, (ErAl2)0.312(HoAl2)0.198 (Ho0.5Dy0.5Al2)0.490, has the most suitable characteristics for the ideal Ericsson cycle, including two kinds of isomagnetic field processes. On the basis of the above consideration, a sintered layer structural complex has been prepared, composed of three kinds of RAl2.15 layers, where R's are rare-earth atoms. From specific heat measurements made on this complex, its entropy and entropy change have been determined. It has been concluded that the complex magnetic material is the most hopeful refrigerant for the Ericsson cycle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339232
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetostriction and magnetic core loss at high frequency in amorphous Fe-based alloys (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3572-3574 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Coercive force Hc and core loss at high frequency f up to 100 kHz were investigated for amorphous Fe-based alloys with various magnetostrictions. Log Hc is shown to be proportional to log f. Magnetic core loss at high frequency for annealed toroidal cores of amorphous Fe-based alloys was shown to be significantly dependent on magnetostriction. Core loss and rectangular ratio in a dc B-H loop are influenced by the number of amorphous tape winding turns N, which is interpreted in terms of surface oxidation of the toroidal core. Very low core losses of 195 mW/cm3 and 350 mW/cm3 (3 kG, 50 kHz) were attained for a ring and a toroidal core, respectively, of the amorphous (Fe0.82Ni0.10Nb0.08)83Si5B12 alloy with a low magnetostriction of 5×10−6.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335010
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Diketopiperadine mediated peptide formation in aqueous solution (1989)
    Springer
    Origins of life and evolution of the biospheres 19 (1989), S. 241-241 
    Details
    ISSN: 1573-0875
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02388829
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    A micro trap for fraction collection in micro-LC (1989)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 12 (1989), S. 63-64 
    Details
    ISSN: 0935-6304
    Keywords: Liquid chromatography, micro-LC ; Packed fused silica column ; Micro trap ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240120122
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Splitless injection method with mixing chamber in capillary supercritical fluid chromatography (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 1 (1989), S. 242-248 
    Details
    ISSN: 1040-7685
    Keywords: supercritical fluid chromatography ; capillary column ; splitless injection ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Mixing, hence dilution, of organic sample solvents with a carbon dioxide mobile phase was an effective method for solute focusing. Mixing was affected by the density differences between sample solvents and mobile phase as well as the orientation of the injector assembly. The use of two mixing chambers connected in series improved mixing and allowed a 1-μL injection.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mcs.1220010507
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    Paper (German National Licenses)
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